US2011110627A1PendingUtilityA1

Beam collimator

33
Assignee: TSAI CHANG CHINGPriority: Nov 7, 2009Filed: Oct 24, 2010Published: May 12, 2011
Est. expiryNov 7, 2029(~3.3 yrs left)· nominal 20-yr term from priority
Inventors:Chang Ching Tsai
G02B 6/262
33
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Claims

Abstract

A device, method of collimating beam coming out from an optical tapered-core guided wave structure with change of index of refraction longitudinally along the axial direction of the tapered-core guided wave structure in the core or cladding region is proposed in this invention. The guided wave structure includes optical fibers and waveguides. The beam collimator in this invention is combined with light couplers and illuminating sources in applications to laser surgery, machinery, probing, measuring, weapons, imaging devices.

Claims

exact text as granted — not AI-modified
1 . A beam collimator comprising:
 a tapered-core guided wave structure with change of index of refractions longitudinally along the axial direction of the tapered-core guided wave structure.   
     
     
         2 . The beam collimator of  claim 1 , wherein the tapered-core guided wave structure comprises:
 an optical fiber.   
     
     
         3 . The beam collimator of  claim 1 , wherein the tapered-core guided wave structure comprises:
 an optical fiber with layered structure in the cladding.   
     
     
         4 . The beam collimator of  claim 1 , wherein the tapered-core guided wave structure comprises:
 an optical fiber with transverse graded index structure in the cladding.   
     
     
         5 . The beam collimator of  claim 1 , wherein the tapered-core guided wave structure comprises:
 a photonic crystal fiber.   
     
     
         6 . The beam collimator of  claim 1 , wherein the tapered-core guided wave structure comprises:
 a square waveguide.   
     
     
         7 . The beam collimator of  claim 1 , wherein the tapered-core guided wave structure comprises:
 a rectangular waveguide.   
     
     
         8 . The beam collimator of  claim 1 , wherein the tapered-core guided wave structure comprises:
 a cylindrical waveguide.   
     
     
         9 . The beam collimator of  claim 1 , wherein the tapered-core guided wave structure comprises:
 a waveguide with multi-layered structure in the cladding.   
     
     
         10 . The beam collimator of  claim 1 , wherein the tapered-core guided wave structure comprises:
 a waveguide with transverse graded index structure in the cladding   
     
     
         11 . The beam collimator of  claim 1 , wherein the tapered-core guided wave structure comprises:
 a photonic crystal waveguide.   
     
     
         12 . A method comprising:
 emitting a collimated beam from a tapered-core guided wave structure by gradually changing the index of refraction longitudinally in a core or a cladding region along the axial direction of the guided wave structure.   
     
     
         13 . The changing of the index of refraction longitudinally of  claim 12  comprising:
 changing of the longitudinal index of refraction continuously. 
 
     
     
         14 . The changing of the index of refraction longitudinally of  claim 12  comprising:
 changing of the longitudinal index of refraction discontinuously. 
 
     
     
         15 . The changing of the index of refraction longitudinally of  claim 12  comprising:
 changing of the longitudinal index of refraction linearly. 
 
     
     
         16 . The changing of the index of refraction longitudinally of  claim 12  comprising
 changing of the longitudinal index of refraction nonlinearly. 
 
     
     
         17 . The changing of the index of refraction longitudinally of  claim 12  comprising:
 changing the index of refraction of the core to approach the index of refraction of the cladding. 
 
     
     
         18 . The changing of the index of refraction longitudinally of  claim 12  comprising:
 changing the index of refraction of the cladding to approach the index of refraction of the core. 
 
     
     
         19 . The changing of the index of refraction longitudinally of  claim 12  comprising:
 changing the indexes of refraction of the core and cladding to approach a value of index of refraction in between the value of index of refraction of the core and the value of index of refraction of the cladding. 
 
     
     
         20 . A collimated beam generator comprising:
 a beam collimator of a tapered-cored guided wave structure with change of index of refractions longitudinally along the axial direction of the tapered-cored guided wave structure;   an illuminating light source;   a light coupler positioned between the illuminating light source and the beam collimator.   
     
     
         21 . The collimated beam generator of  claim 20 , wherein the illuminating light source comprises:
 a coherent light source.   
     
     
         22 . The collimated beam generator of  claim 20 , wherein the illuminating light source comprises:
 an incoherent light source.   
     
     
         23 . The collimated beam generator of  claim 20 , wherein the light coupler comprises:
 a lens set.   
     
     
         24 . The collimated beam generator of  claim 20 , wherein the light coupler comprises:
 a gratings set.   
     
     
         25 . The collimated beam generator of  claim 20 , wherein the light coupler comprises:
 a holograms set.

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